Related Clues:

• Like xenon and neon
• No longer fresh
• Heliumlike
• Lacking originality, as a joke
• Lethargic
• Not reacting chemically
• Like a bump on a log
• No longer novel
• Nonreactive
• Unresponsive
• Unable to move
• Past the expiration date
• In need of freshening
• Not at all active
• Powerless to act